AT90LS4433 datasheet(89/126 Pages) ATMEL

部件名	AT90LS4433

功能描述	8-Bit AVR Microcontroller with 4K Bytes of In-System Programmable Flash

PDF	126 Pages

Scroll/Zoom	100%

制造商	ATMEL [ATMEL Corporation]

网页	http://www.atmel.com

标志

89 / 126 page

AT90S/LS4433

1042H–AVR–04/03

G: Write Data High Byte

Set BS to “1”. This selects high data.

Give WR a negative pulse. This starts programming of the data byte. RDY/BSY

goes low.

Wait until RDY/BSY goes high to program the next byte.

(See Figure 64 for signal waveforms.)

The loaded command and address are retained in the device during programming. For

efficient programming, the following should be considered:

•

The command needs to be loaded only once when writing or reading multiple

memory locations.

•

Address High Byte needs to be loaded only before programming a new 256-word

page in the Flash.

•

Skip writing the data value $FF, that is, the contents of the entire Flash and

EEPROM after a Chip Erase.

These considerations also apply to EEPROM programming and Flash, EEPROM and

signature bytes reading.

Figure 63. Programming the Flash Waveforms

$10

ADDR. HIGH

ADDR. LOW

DATA LOW

DATA

XA1

XA0

XTAL1

RDY/BSY

RESET

12V

AT90LS4433 数据表(PDF) 89 Page - ATMEL Corporation